Quayage is a term that refers to the dockage or usage fees charged for shipping vessels that use a particular port or harbor. Synonyms for quayage may include dock dues, harbor fees, pier rent, wharfage, or berthage. Dock dues and harbor fees specifically refer to the charges for docking and using a harbor or dock facilities. Pier rent, wharfage, and berthage all describe charges associated with specific port infrastructure like piers, wharfs, and individual berths. In general, all of these terms describe charges levied on shipping companies for the use of port facilities and can be used interchangeably with the term quayage.